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This is because it is the prime mover in both cases. 2. Antagonist: The antagonist in a movement refers to the muscles that oppose the agonist. During elbow flexion where the bicep is the agonist, the tricep muscle is the antagonist.
A antagonist muscle is the muscle that opposes the agonist. So using the same example, during a biceps curl, the triceps is the antagonist muscle. This muscle relaxes as the biceps contracts. A synergist muscle is one that stabilizes a joint around which movement is occurring and helps to create movement. So again with the curl example, the brachialis and brachioradialis are the synergists muscles. They assist the biceps muscle and stabilize the elbow. When dropping the weight back down during a biceps curl exercise, the triceps becomes the agonist muscle and the biceps becomes the antagonist.